Frequently Asked Questions About Mack CV/GU Truck Universal Elbows, Piping & Components

Will these universal elbows fit my specific Mack CV or GU model year?

Our universal elbows are designed to fit Mack CV and GU series trucks from 2000 to current model years. The 5-inch diameter elbows work with standard DPF and muffler systems. However, trucks with custom exhaust modifications may require additional adapters. We recommend measuring your existing exhaust diameter before ordering - most CV/GU models use 5-inch systems, but some specialty configurations may vary.

What's the difference between aluminized and stainless steel options?

Aluminized steel elbows offer good corrosion resistance at a lower price point and typically last 3-5 years in normal conditions. Stainless steel (409 or 304 grade) provides superior durability, lasting 7-10+ years, and better handles extreme temperatures and road salt exposure. For trucks operating in northern climates or coastal areas, we strongly recommend stainless steel. Aluminized works well for moderate climates and standard highway use.

Can I install these elbows and pipes myself, or do I need special tools?

Most installations can be completed with basic hand tools including wrenches, a reciprocating saw for cutting pipes to length, and exhaust clamps. The job typically takes 2-3 hours for someone with moderate mechanical experience. You'll need jack stands to safely access the exhaust system. Common challenges include removing corroded clamps and aligning multiple joints - having a helper makes the job much easier. Professional installation usually runs $150-300 if you prefer not to DIY.

How do I know what degree elbow I need - 45, 90, or something else?

The degree you need depends on your exhaust routing. Most Mack CV/GU trucks use a combination of 45 and 90-degree elbows. Stack exits typically require one 90-degree elbow, while side exits often need two 45-degree elbows or one 90-degree. Check your current setup before ordering - count the bends and note their angles. If you're unsure, our customer service team can help identify the right configuration based on your truck's exhaust exit style.

Why are my new elbows leaking at the joints after installation?

Exhaust leaks at joints are usually caused by improper sealing or misalignment. Ensure all connecting surfaces are clean and free of rust or debris. Use high-temperature exhaust sealant rated for 1000?F+ on all joints before clamping. Tighten clamps evenly to avoid warping the pipes. If using band clamps, torque to 60-70 ft-lbs. For persistent leaks, check that pipes are cut square and not bent during installation. Double-check that you're using the correct clamp size - 5-inch pipes require 5-inch clamps, not 4.5 or 5.5-inch.